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Handeling the dates and the leap year with AJAX and jQuery

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Almost all web 2.0 platforms lean toward using an existing e-mail as a form of authorization and authentication. Usually you don’t need to use a user name to login or register at a certain site. What they are mostly doing though is the birth date validation. I just encountered a site, which doesn’t allow a registration to the people younger than 25 years old. If you went through the registration process and you are older than 25, your re-registration process might be blocked. If you really want to register though and have enough knowledge you can delete your cookies, restart your router (or any other method depending on how you are connected to internet) and register anyway, however probably 90 percent of users doesn’t have that knowledge.

There are plenty of tools around internet, which can display calendars with the help of JavaScript, however they are not completely clear enough for all people using internet. Therefore for one of my projects I had to provide three drop down fields, which should be able to handle birth date of new registered users. This task would be easy, if each month had the same amount of days. OK, even if every other month would have the same amount of days this task wouldn’t be that difficult, but you cannot forget that February has 28 days and every four years we have a leap year, when February has 29 days. In this example I will show you, how I accomplished this task using the unobtrusive JavaScript, the beauty of AJAX and jQuery (and a little bit help of PHP:).

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